/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.zookeeper.client;

import java.net.InetSocketAddress;
import java.util.ArrayList;

import org.apache.zookeeper.common.PathUtils;

/**
 * A parser for ZooKeeper Client connect strings.
 * 
 * This class is not meant to be seen or used outside of ZooKeeper itself.
 * 
 * The chrootPath member should be replaced by a Path object in issue
 * ZOOKEEPER-849.
 * 
 * @see org.apache.zookeeper.ZooKeeper
 */
public final class ConnectStringParser {
	private static final int DEFAULT_PORT = 2181;

	private final String chrootPath;

	private final ArrayList<InetSocketAddress> serverAddresses = new ArrayList<InetSocketAddress>();

	/**
	 * 
	 * @throws IllegalArgumentException for an invalid chroot path.
	 */
	public ConnectStringParser(String connectString) {
		// parse out chroot, if any
		int off = connectString.indexOf('/');
		if (off >= 0) {
			String chrootPath = connectString.substring(off);
			// ignore "/" chroot spec, same as null
			if (chrootPath.length() == 1) {
				this.chrootPath = null;
			} else {
				PathUtils.validatePath(chrootPath);
				this.chrootPath = chrootPath;
			}
			connectString = connectString.substring(0, off);
		} else {
			this.chrootPath = null;
		}

		String hostsList[] = connectString.split(",");
		for (String host : hostsList) {
			int port = DEFAULT_PORT;
			int pidx = host.lastIndexOf(':');
			if (pidx >= 0) {
				// otherwise : is at the end of the string, ignore
				if (pidx < host.length() - 1) {
					port = Integer.parseInt(host.substring(pidx + 1));
				}
				host = host.substring(0, pidx);
			}
			serverAddresses.add(InetSocketAddress.createUnresolved(host, port));
		}
	}

	public String getChrootPath() {
		return chrootPath;
	}

	public ArrayList<InetSocketAddress> getServerAddresses() {
		return serverAddresses;
	}
}